Recent questions tagged C++

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c++ - Why should I use DECLARE_DYNAMIC instead of DECLARE_DYNCREATE?

DECLARE_DYNCREATE provides exactly the same feature of DECLARE_DYNAMIC along with its dynamic object creation ability ... of DECLARE_DYNCREATE? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Including <termios.h> and <asm/termios.h> in the same project

What I want to achieve: I want to set custom baud rate values for some tty*-like UART-mapped terminals. ... a namespace, like mentioned here)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - problem with template inheritance

I'm trying to understand whay i get an error on this code: (the error is under g++ unix compiler. VS is compiling ... write "A::" every time... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Offset of pointer to member

template<class T, typename U> ptrdiff_t foo(T U::* m) { // return offset } How I can get the offset ... in advance for any help. Best regards See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - VS2012 Error: The application was unable to start correctly (0xc000007b)

I received the error "The application was unable to start correctly (0xc000007b)" after attempting to run my exe ... dll What is the problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Accessing a Java object in a Java object in C using JNI

I'm relatively new to JNI and have gotten down the basics of messing with integers and arrays in Java objects using ... on what I'm doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calling another constructor when constructing an object with const members

I have a class with const members, and one constructor which calls another constructor with extra values filled in. ... the best solution here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is overloading on all of the fundamental integer types is sufficient to capture all integers?

Let's say I have function overloads for all standard integer types: void foo( char ); void foo( ... for redefinition of existing overload. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - On Windows is there an interface for Copying Folders?

I want to copy folder A and paste to desktop. I am currently using C++ so preferably an OO interface if available. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How many clock cycles does cost AVX/SSE exponentiation on modern x86_64 CPU?

How many clock cycles does cost AVX/SSE exponentiation on modern x86_64 CPU? I am about: pow(x, y) = ... of cycles can cost exponentiation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to return "not found" when return value is const reference

I have a problem that when I use something like this: const MyList& my_list = getListForThisRegion(/*region ID, ... simply knowing the syntax)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Unqualified name lookup: Why local declaration hides declaration from using directive

Consider this code: namespace A { int i = 24; } namespace B { using namespace A; int i = 11; int k ... name lookup. Why is i unambiguous? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - gcc nullptr issue

I am porting existing code to compile under gcc 4.7.2 and have run into a strange issue with nullptr. I have ... , or if I'm missing something. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - glibc application holding onto unused memory until just before exit

I have a C++ application (gcc 4.9.1, glibc 2.17) running on Linux (Centos 7). It uses various third- ... 't my program give that memory back? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to provide your own delimiter for cin?

In c, I can use newline delimeter ([^ ]) with scanf. Using which I can store the line. Similarly for ... functionality with cin object in cpp. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to identify whether or not std::unordered_map has experienced hash collisions?

How to identify whether or not the keys in a std::unordered_map have experienced hash collisions? That is, ... collision chaining is present? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Reading multiple lines from a file using getline()

I am trying to read in and then output the contents of a text file with three lines, as follows: Bob Dylan 10 9 ... lines, so I'm a bit lost. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - libpng "png_set_longjmp_fn" not found

I'm using libpng from ubuntu and when I try to compile a c++ file I get undefined reference to ` ... code. Thank you in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can I check in C(++) if an array is all 0 (or false)?

Can I check in C(++) if an array is all 0 (or false) without iterating/looping over every single value ... runtime and do some bitflipping on it See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Friend declaration specifying a default argument must be a definition

Since updating to XCode 5.1 one of my projects now has that error in the title and will not build, I have ... it is doing what it should. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ cli - what is the C++/CLI syntax to subscribe for events?

I'm updating some old Managed C++ code with lines like this: instanceOfEventSource->add_OnMyEvent( new EventSource:: ... in C++/CLI? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Cannot use movable objects with Boost.Asio

Reading this, I got the impression that this code should work: class Connection : public std::enable_shared_from_this< ... with C++11 support) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Get original SQL query from prepared statement in SQLite

I'm using SQLite (3.6.4) from a C++ application (using the standard C api). My question is: once a ... the actual parameters that was bound. :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Opengl Vertex attribute stride

Hey. I new to OpenGL ES but I've had my share of experience with normal OpenGL. I've been told that using ... me with this? Thanks a lot. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - SSE42 & STTNI - PcmpEstrM is twice slower than PcmpIstrM, is it true?

I'm experimenting with SSE42 and STTNI instructions and have got strange result - PcmpEstrM (works with explicit length ... (); return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - lvalue binding to rvalue reference

I am trying to understand how lvalues bind to rvalue references. Consider this code: #include <iostream> template< ... do it without templates? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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711 views

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c++ - Passing (partially) templated template function as std::function(or function pointer)

#include <vector> #include <functional> template<class F> class Foo { public: template <class T> void std_function ... work as my intention? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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765 views

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c++ - Range-based for over pair list

Say, I want to iterate a number of pairs defined inline. Is there a shorter way to write: for(auto pair : std:: ... 3,4}}) // ... ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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